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1.1 This practice covers a guide for metal finishers to clean and then provide a paint base for the finishing of magnesium and magnesium alloys using chemical conversion coatings. Where applicable (for example, aerospace) secondary supplementary coatings (for example, surface sealing) can be used (see Appendix X1).
1.2 Although primarily intended as a base for paint, chemical conversion coatings provide varying degrees of surface protection for magnesium parts exposed to indoor atmosphere either in storage or in service under mild exposure conditions. An example is the extensive use of the dichromate treatment (see 5.2) as a final coating for machined surfaces of die cast magnesium components in the computer industry.
1.3 The traditional numbering of the coating is used throughout.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1732 Practices for Preparation of Magnesium Alloy Surfaces for Painting
SAE StandardAMS 2475 Protective Treatments--Magnesium Alloys
Military SpecificationsDTD 5562 (British), Clear Baking Resin for Surface Sealing Magnesium DTD 911 (British), Protection of Magnesium-Rich Alloys Against Corrosion DTD 935 (British), Surface Sealing of Magnesium Rich Alloys MIL-M-3171 Magnesium Alloy, Processes for Pretreatment and Prevention of Corrosion on
ICS Number Code 77.120.20 (Magnesium and magnesium alloys)
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ASTM B879-97(2008)e1, Standard Practice for Applying Non-Electrolytic Conversion Coatings on Magnesium and Magnesium Alloys, ASTM International, West Conshohocken, PA, 2008, www.astm.orgBack to Top